| 359 / | HD | OPTICS: SYSTEMS (INCLUDING COMMUNICATION) AND ELEMENTS |
| 577 | DF | LIGHT INTERFERENCE {2} |
| 580 | DF | .~ Produced by coating or lamina {7} |
| 586 | ![]() | .~.~ Layers having specified index of refraction {2} |
| 587 | DF | .~.~.~> Plural layer groups lateral in parallel light paths |
| 588 | DF | .~.~.~> Filter having four or more layers |